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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a00b93206be5cc29a7a48d139fd96de22cf6bea26b4060416916ed83ae9d8ea' 
  AND token = 'IFyofYotrlJAq+v+oLefKC1NJ6cYSoVjJnD7EhsDUTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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