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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd47a3c0b3f241d4f4d5d1dc999570c0f5e5f50c6c847eabf4a334b8ae10495f4' 
  AND token = 'dblJsSIyNV5rV+EH/lLqUsah0qpgc2vMisB3h/B8Om0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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