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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c86128e4c63aa6a07345978f7159b81148349eab948d0c1cf2eb6c528e1b62dc' 
  AND token = '+c9ClfWPWnoKCICdsbUuH2wEQsRS9i+kpdQACei3VSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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