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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a20700a1612b6090da9556d55b3a80473c65772f4777b256e2e09d3ef7ee3316' 
  AND token = 'FeO+agGll46FWTk/T5Dd5mKmjWjW/60yDKDUC8LBmao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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