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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94cdd89346392531c6e0f7600e467ca56ce69f74cadbe85779c8b1d98565a925' 
  AND token = 'XiZr+3Df9cb0J9UlmlBzknlKbieqa4nLkCU5+JZpj1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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