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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f86e907eb3662e921b880c9c1ed847fdd652dbe615b17e8706569ac2812c87e' 
  AND token = 'QQH9UE85T1sshQHBbp/H0yNcsK3SJ7uzU+17+0sevNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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