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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a9c44c2955cbe043f2345ac3b10d9043cd41d243320e9995b979e95c3cd0ff3' 
  AND token = 'wajTigWkn8N+scNe3KjcQfV0TDFi/B26hGtk1XWqn9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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