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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3173fe9dc07f9a78593b48302a97961d9210c09cd0e1f1cbb86739317aaab07d' 
  AND token = 'zzmjmM1MGfNyFuPOHTPDsZXx0DcsB4tHxz4woJpUSVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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