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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3541f8c084ea02749c8f1fcc389caee35d004edea0f78cf6e59ebe2f31b71594' 
  AND token = '0Chi0t/YnvbgUkkPuCS0nTrrDcK85I60Ot+Q6h6j5TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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