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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7fd27a8e4a83e33397abed8a812dcd54de2bebd151087c027e1a6ba016aea5b' 
  AND token = '6h1/DMU/NX9QUc+I5LnVBquKbXRPhsT/XjVcVsa45nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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