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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac019c9cb3d30d0ed066fa5dd7eac1c9a6aeec8bafebe3e2ad0129aa8ac935a' 
  AND token = 'HQvvJtc0sBunhFX0AxkyOXFTlmRDN586tceChp3tsBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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