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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e71ad629c61c75f47e4cf9d70e45a8d1c53c47073599ee3ee99a3b7b4e6f0c1' 
  AND token = 'elIVMfsZUjnXO6dnQG8SICD04ufzOlxh3sNPIie/eMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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