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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08f40ae0743fb4886c1e68a2ce62e90cd0046881d405f4b471885f8fb97d646e' 
  AND token = '4Bt0GI60b3Ow7JCrT0hSDPudGMUR2nC8FpOBmGIhOPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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