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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '865ef930b0d0026847a6adfb672360e64ae4f9cfb7a6c3cc4923427b66b6590a' 
  AND token = 'wcLpK+5beAFowlythOkfIgKNrsNU100zVOZrVv9eJAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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