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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9622c99db30768d0c82ae43eb80240369cfd28ff5c313f3794acf4d504167cc3' 
  AND token = 'gkco4ccCxp2XbtDdVK7O+MERCwQuNJxh+5ZiCs64uKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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