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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a55aa9247495574c3a8f178496a58348312da3e4ee848e77a26dd6194c7eb6a8' 
  AND token = '20M59Er83YBXzIhlg2citYi3GYu2HgVjPW1wlBM3iWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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