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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f28a26af3b31ce29f3e94290afeaced017c267a2b0c5d1dbb2b5c39ea4b9829' 
  AND token = '69WaxBiTjZLeWViVMPCYDqZ6aGXDOs5y22KpNLPgHf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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