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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5112003930c41814e9025660f298df3b1f5de1a3602a28c9442527aa7907c802' 
  AND token = '5qofHaAHWuUSrc4uG0BnMGui6Ktj4f64BD/jwApZ+cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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