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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6772427a48640a511e0688f92e6f49f605dd653c1f5c311a9aede7966374dea9' 
  AND token = 'klulFXkO8I5UXg+O6VCrXIrkrummntWGjNYI9ifZAd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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