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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2638dcef9fb50026d523beb7f6a669251b21c0a4f8602fb12c9b20cfc4ab6957' 
  AND token = 'zuqwoxtRUcAGp1uZjQfiPRk+I3N4fsXeqb+0zJrMorE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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