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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5128fe15b581c6352cebc6ef69280b1384b6b1d93a8607b264fb1d7a4d02e0e' 
  AND token = 'HpwPzJ6Z8XyhS6vdgsy72zNbf85RpiJprfd4kqGlyVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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