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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f72a6eae704e8cf21d6ab1541001607340e7c83de09e2f90c8abcb23cd0bf5d' 
  AND token = 'PSrc49154yKHxykM+2pFX7tu9qqrs1Vwx1QWQPYn4ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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