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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c653b9f00b34c1adf59928ef27b8743aba2dc359e75a70952eaf3dc4e1e2817' 
  AND token = 'OvX3HrY9hNhaxb411NVKgCZtcS1jeMsycKEsAossHyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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