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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84efafd6fc050ff521457b0d73c677e675f2edb02f2096d8a6d9dd5bc68f7541' 
  AND token = 'R5s1+9cB4iEpCxmptFeWF0b841kjNUV/9VEHB6sKu5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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