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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '638596cb65d82a352cef6c2ff2748da97a626139a20311554b867c8a19f68cbb' 
  AND token = '3dTyr74txjd10QYCBg3p3YKsXek5zicgJ+tW97OYiio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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