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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c44144d4b0da571376942bbdb69463e168deb2e501d7492e2a3f250ed57b848' 
  AND token = '1DcVaFyLb0j9YHUut73XhhJfR+oJc28VhwoWnLryY1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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