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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ad872ec0c097d06423a414b6707b5357facd14660c28ae54eea8fd2fe28dc08' 
  AND token = 'iYe+9XmVKWTc4kuQ7ex/VZRcxZg9AYYmnL1YdkKZ4EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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