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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3111f96fcedc238b83480180a200ae4eb89b403acf15acc29e40aa3adcf034a' 
  AND token = 'T0LG2bIvD/0WEr5XfNoGe9vpH3rEDMWlYGjkUwp6oH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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