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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3eb89aafe3af1c0a58b9e9744b133c748c0b19ef9fd484bc9fe97f7ae7126bc' 
  AND token = 'bGs4yA8+/U98OfQTotikFq8TnJQcBgnx7EMcCmyzjHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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