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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f4b3675cc457fef20a7cbb4d9fcb6a8f51d4784f409a4e83a4d339e7b1b42f3' 
  AND token = '8gEucwHET/a8GD9gVOtnPN9DJuMkEkS9vGI1UNqS3PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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