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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c436b7901c12d21a9f97c14344609f12fc89f6c373e5ca05afe2a0fa23bfccf' 
  AND token = 'VetQkltUIu4J2Yo3tcf/Lufd9NYen1mMKx6Jf2g1cW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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