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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81dcfa8327c2ca3c777275b1c6f44dee005bbf3561caa9ef5581c6b2442d15db' 
  AND token = 'Pes61U7xmDRqqO9aT4sRmdhr7AXpiouWIRx3swjfqoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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