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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcbfd12034bd5f3fce8ac19c5ab618a6192a2e06b8c8c075b3c55e00a2657937' 
  AND token = 'AqodUUNMRiwbU6qw0WlZ0GsaIKfuuzGuywlPA9uo34w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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