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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d2c80e37d2e02dbdbda95d755e27f74e47a17a87980ec62360a1eab9491c77c' 
  AND token = 'NwqONtdAdWoZzRzHSXx3DTQBK0PzHOcDdW+1sI+DOqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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