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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b74e7693edc4c19c7e3497f2571971c7f6670c239a80d4d963a6cc07a4de41c' 
  AND token = 'Avt1yckzH3b2aLIi4aNoI3GOy72GDGuyBNYKS4YzFMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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