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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0823c244d52b522b3ed52b32df9cd5ddaea7a0c4aafba250e101645a4a6c6184' 
  AND token = 'Y4vnjgMYE61XR81+jr4UBInyJGUAqC805rSTCu+5Y78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}