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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a3c920f86a218d0eaf255fe2ac1559d1aef57b85e26f7c2e46ffd8b9ebb24e9' 
  AND token = 'sTePtjprEOKEf1CVx+UyNY5WDPDWzjlLH1NalhxU7W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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