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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a2744242ec0871497fcc9ee1123583a5cbb346b763dcf7dd511bac90d9905e' 
  AND token = 'TQq9IqzaOpXBVcvqtN/OOc+biwa9sCvN3sVyMbK/J/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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