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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef7b80f0002672b6dd7260db5ad29e561f030b1fcf4d3a756f8427177d4d76d3' 
  AND token = 'J/UXO7ttdLhbsv2duy+1nL5d5R3uU1U5+iYYBBggPco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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