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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd7039b7c6b86a62dd1f8253f53d2f710933ef78e67f69ddfefa6f0dcf064c4d' 
  AND token = 'kXVj5OHkkhrwjsrYfjQAvyWhM0e3BDLOedfWo4vf2Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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