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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3507adae1dda40465c39cab5330369ba888ec4e344a8a8018ecd7557ba9d18da' 
  AND token = 'pIpF8CklWrmS+08huVBy+EtnHQG1CUNGrXi0pDSnHgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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