SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dbcc81798a29f0445a5a6c1b591ff04d337bced2bf3f6a619567c1d3a7466b9' 
  AND token = 'Em2019OfpkOylTW5nhqnwtGhF+hQ9l428STXQ4JqYjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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