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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '496ed7ee6e9ebaa5fc9270f083bd4adef002730ef26c9f96e48e2404fad4294a' 
  AND token = 'F/R0HD7dOQcZ6vVAXnIqfaD1anJWQbe/FtCZtsd9TSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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