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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5375ad93e760368aa92c5862352690feccda2eb649a0f890964cc95992a58a1f' 
  AND token = 'lpp0HQg9Ur7pwuPqYg4NfTnxANZdNj4uEx3u68J+o1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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