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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f0d2a84f74b8f47914793e9d5cdd140a2dc4cf74f4bdda80b7044c59f4c5275' 
  AND token = 'Fe7qjUN0sWY9v2y38GMXsL3p3qT1R8NuLLO099U0lC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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