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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fa7593cf74e1e407dc65fffbad8907415e4452d713b03d3144e729e23d6b56c' 
  AND token = 'icfqfppbftuM4BE1XffLtC/1i0whX8CkxMOo4Ig0G3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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