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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8876bdb37c863ffa7264c812fa690abf96334f8a3eb21347fea470f0929ecf6' 
  AND token = 'KArD+76BgjXVXyTdeufimmXAZ/TJNb7nGKY4jNWy+3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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