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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a1078dfb9fef13959ef3e84ae592957f6c79ab87511e6d0681574a95813581f' 
  AND token = '2Pl5+SV2BtDTFgNMtlvqnvsgkCUf3BnOTvcL7N8JypQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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