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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e04fb1ce264045a7a59ed31c948322f388e5f201cce4f06409c24dae02fc2730' 
  AND token = 'DiQYlE9kaS3SxD8IN1jzt602KRf29qew5AaCjv4c7x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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