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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b2767f749423317d727adae5bf7d92510951e12aeaf5bd74864c2eef6b4637' 
  AND token = 'K/pQTAl2oGFyuyCR1HTMeHT+m66gPhnb6fiSsPOBwP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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