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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6e8e096a23a736143ba4c50233d6f7d51a1b2daaa9685890ee49b1c86ec83a8' 
  AND token = 'VaiGW6kFniZBLWTpG9a050GhdoS4H4OSfSdmA7TrJ/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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