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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bb6c516748e9d0807e2f4e900e06b4faa62e7a37894ef32e108427d929dd7bd' 
  AND token = 'y54J2TyFkQEASnQn8hiqrCzvP/HfW6GVgp75Wp8sb34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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