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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67b6970a15400a58b9b2a0c2e118d1f22057731f414994c706422064ca6bac3e' 
  AND token = 'ZABDyR6QbxijxDP70wnfplaD65Swnt24lJAhQJyiQGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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