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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1944f3f68b9c9c473b532d7ac1048e32ae040f4375d3824713e6d41621ce4d7e' 
  AND token = 'rSY9LRWgF2PjMUUDfyTdcA4raTeNhSrOoMzDiiAwkZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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